SzomolnokiteFeSO4 · H2O

Szomolnokite, a member of the kieserite
group, is rare at Mont Saint-Hilaire.

PHYSICAL CHARACTERISTICS:

Color is usually white or yellow.Luster is vitreous.Diaphaneity is translucent. Crystal System is monoclinic; C2/c.Crystal Habits include thin crusts and coatings on pyrrhotite.Cleavage none observed.Fracture is conchoidal to uneven.Hardness is 2.5Specific Gravity is approximately 3.05 g/cm3.Streak is white.Associated Minerals include amphibole group, garnet group, microcline, pyrite, pyrrhotite, siderite and sphalerite.Distinguishing Features: None from white powdery species.Origin: Named in 1877 after its discovery locality, Szomolnok, Slovakia.